EP 4127814 A1 20230208 - WAVEGUIDE FOR AN AUGMENTED REALITY OR VIRTUAL REALITY DISPLAY
Title (en)
WAVEGUIDE FOR AN AUGMENTED REALITY OR VIRTUAL REALITY DISPLAY
Title (de)
WELLENLEITER FÜR EINE ANZEIGE DER ERWEITERTEN REALITÄT ODER VIRTUELLEN REALITÄT
Title (fr)
GUIDE D'ONDES POUR UN AFFICHAGE À RÉALITÉ AUGMENTÉE OU À RÉALITÉ VIRTUELLE
Publication
Application
Priority
- EP 20168055 A 20200403
- EP 2021057311 W 20210322
Abstract (en)
[origin: WO2021197907A1] A waveguide (1) for use in an augmented reality or virtual reality display, comprising: an output diffractive element comprising a plurality of optical structures (22, 28, 26) in a photonic crystal; a first major surface of the waveguide, and a second major surface of the waveguide, the first major surface separated in a direction perpendicular to a plane of the waveguide from the second major surface, wherein light propagates along the waveguide towards the output diffractive element by undergoing total internal reflection between the first and second major surfaces wherein the plurality of optical structures (22, 28, 26) are arranged in a plane of the waveguide in an array which is configured to receive light from an input direction and diffract the light into a plurality of orders, some of the orders being diffracted in the plane of the waveguide at an angle to the input direction to provide 2D expansion across the plane of the waveguide, and other orders being out-coupled in a direction perpendicular to the plane of the waveguide towards a viewer; wherein at least one of the optical structures (22, 28, 26) of the plurality of optical structures (22, 28, 26) has a profile in a direction that is perpendicular to the plane of the waveguide, wherein the profile varies along one or more directions parallel to the plane of the waveguide, such that the out-coupled orders are provided preferentially from the first major surface of the waveguide compared to the second major surface of the waveguide.
IPC 8 full level
G02B 27/00 (2006.01); G02B 1/00 (2006.01); G02B 27/01 (2006.01)
CPC (source: EP KR US)
G02B 1/005 (2013.01 - KR); G02B 27/0081 (2013.01 - EP KR); G02B 27/0172 (2013.01 - EP KR US); G02B 27/0944 (2013.01 - US); G02B 1/005 (2013.01 - EP)
Citation (search report)
See references of WO 2021197907A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2021197907 A1 20211007; CN 115362405 A 20221118; EP 4127814 A1 20230208; KR 20230018363 A 20230207; TW 202142920 A 20211116; US 2023161162 A1 20230525
DOCDB simple family (application)
EP 2021057311 W 20210322; CN 202180026123 A 20210322; EP 21712860 A 20210322; KR 20227038469 A 20210322; TW 110112254 A 20210401; US 202117995372 A 20210322